The word "more coldish" implies that something is colder than usual, but not quite freezing. Its antonyms would be words that describe something warmer or less cold. Some examples would be "less chilly," "warmer," "cozier," "temperate," and even "milder." These words suggest a level of warmth that is comfortable or even pleasant, without being too hot. When used in the right context, such antonyms can create a vivid contrast with the original term, instantly conveying a different set of emotions and setting the right mood or tone for a conversation, story, or presentation.